<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style>
        /*类选择器  .class   可以多个复用*/
        .qinjiang{
            color: deepskyblue;
        }
        .qinqin{
            color: black;
        }
        .qin{
            color: blue;
        }
    </style>

</head>
<body>

<h1 class="qinjiang">标题1</h1>
<h1 class="qinqin">标题2</h1>
<h1 class="qin">标题3</h1>

<p class="qinjiang">p标签</p>

</body>
</html>